please help me with these! I really need an explaination for each problem so I can understand. Thank you!

Answer questions 1-4 based on reactions of compounds 1-4 with reagents 5-9. 2 3 4 HCl5H2SO46NaOCH37NaCl8H2O9 1. Which reactants would be best for producing an SN2 product? A) 1&5 B) 2&7 C) 3&8 D) 4&7 2. Which reactants would be best for producing an 5N1 product? A) 1&5 B) 3&8 C) 4&7 D) 4&8 3. Which reactants would be best for producing an E2 product? A) 1&7 B) 2&6 C) 2&7 D) 4&8 4. Which reactants would be best for producing an E1 product? A) 1&5 B) 1&8 C) 18.9 D) 2&7 1. 2. c. Provide reagents to complete the following schemes. More than one step may be required. 1. 2. 3